package org.example.web.global;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 登录拦截器
 */
public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String url = request.getRequestURI();
        //请求为登录请求就放行
        if(url.toLowerCase().indexOf("login") >= 0){
            return true;
        }
        //为非登录请求，检查是否已登录
        HttpSession session = request.getSession();
        if(session.getAttribute("employee") != null){
            return true;
        }
        //非登录请求，也未登录,跳转到登录界面
        response.sendRedirect("/to_login");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
